make js file available throughout SharePoint site collection in office 365

Hello All,

I have deployed a java script file on my office 365 SharePoint site collection by custom action like 

<CustomAction ScriptSrc="~SiteCollection/Style library/DW/Scripts/DW.my.Global.js"
                Location="ScriptLink"
                Sequence="400"
                 />

it got deployed and avaialable in site but this is not available for sub sites of my root site. Any suggestions how can i make it available for sub sites of my site collection. ()